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Basis of Presentation and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Revenue from External Customer [Line Items] |  |
Revenue under percentage of completion | $ 255.5 | $ 336.1
Costs incurred on uncompleted contracts | 1,261.3 |
Estimated earnings to date | (59.9) |
Aggregate costs incurred on uncompleted contracts and estimated earnings to date | 1,201.4 |
Billings to date | (1,202.0) |
Net billings in excess of billings after acquisition | (0.6) |
Costs in excess of billings | 28.8 |
Billings in excess of cost | (29.4) |
Net billings in excess of costs and estimated earnings | $ (0.6) |

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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method. + References No definition available. + Details
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